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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83d5f690084ce6e5ea2cf31f74e082f37540cde2fc114a0957a02b24c1ee4b8' 
  AND token = 'GHBCguwJx5NpxYL7od/dcgbAZNAlppMRjf/Sd6zjSgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 1.41925

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}